Nanocrystalline Fe-(Co,Ni)-Si-B: The mechanical crystallization of amorphous alloys and the effects on electrocatalytic reactions

Trudeau, Michel; Huot, Jacques; Schulz, Robert; Dussault, D.; Neste, A. Van; L’Éspérance, Gilles

doi:10.1103/physrevb.45.4626

Cited by 65 publications

(31 citation statements)

References 18 publications

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“…The product of the reaction (a black porous precipitate) was filtered on a fritted glass funnel with suction (water pump), washed with absolute ethanol, and dried at 50°C. The X-ray diffraction spectrum was identical to that reported for amorphous Ni2B (2,(3)(4)(5)(6). The particles had a spherical shape with an average diameter approximately equal to 0.5 p,m according to scanning electron microscopy (SEM).…”

Section: Electrodessupporting

confidence: 58%

“…There is a competition between hydrogenation (reaction [3]) and the desorption of hydrogen by an electrochemical (Heyrovskjl reaction [5]) and (or) chemical (Tafel reaction [6]) pathway.…”

Section: ] Y = Z + M + ( Y = Z ) Mmentioning

confidence: 99%

“…[S] and (or) [6]), that is, on the relative rates of reaction [3] and reactions [S] and (or) [6]. Since the hydrogenation step involves the reaction between the adsorbed organic substrate and chemisorbed hydrogen, accessibility of the sites for the adsorption of the former (mass transfer to the active sites) is bound to play a role in the ECH reaction (see below).…”

Section: Raney Nickel Electrodesmentioning

confidence: 99%

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A comparison of nickel boride and Raney nickel electrode activity in the electrocatalytic Hydrogenation of Phenanthrene

Mahdavi¹,

Łoś²,

Lessard³

et al. 1994

Can. J. Chem.

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BEHZAD MAHDAVI, PRZEMYSLAW LOS, MAIUE JOSCE LESSAFD, and JEAN LESSAFD. Can. J. Chem. 72,2268Chem. 72, (1994. The electrocatalytic activity of nickel boride in the electrocatalytic hydrogenation (ECH) of phenanthrene in ethylene glycolwater at 80°C has been compared to that of Raney nickel and fractal nickel. The intrinsic activity of the electrode material (real electrode activity) is the same for nickel boride and Raney nickel electrodes and is lower for fractal nickel electrodes. The apparent electrode activity of nickel boride pressed powder electrodes (Ni2B electrodes) is less than that of codeposited Raney nickel (RaNi) electrodes and pressed powder fractal nickellRaney nickel (NilRaNi = 50150 to 01100) electrodes. The apparent activity of Ni2B electrodes is improved by adding sodium chloride to the powder and dissolving it after pressing (Ni2B-NaC1 electrodes). The Ni2B-NaCI electrodes have the same apparent activity as codeposited RaNi and pressed powder NilRaNi (20180 to 01100) electrodes. The apparent and real electrode activity of NilRaNi electrodes increases with the RaNi content up to a 20180 ratio. The Tafel and alternating current (ac) impedance parameters were determined for the hydrogen evolution reaction (HER) in 1 M aqueous sodium hydroxide at 25°C at nickel boride and at codeposited RaNi electrodes. The intrinsic electrocatalytic activity for HER, expressed by the ratio of the exchange current density over the roughness factor (IdR), is similar for Ni2B, Ni2B-NaC1, and codeposited RaNi electrodes. Surface characterization of Ni2B and Ni2B-NaCI electrodes was canied out by BET, ac impedance, scanning electron microscopy, and mercury porosimetry. No direct relation between the apparent electrode activity in ECH and the surface measured by BET and ac impedance was found. The ac impedance measurements were also carried out in the presence of sodium trans-cinnamate.

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Section: Electrodessupporting

confidence: 58%

“…There is a competition between hydrogenation (reaction [3]) and the desorption of hydrogen by an electrochemical (Heyrovskjl reaction [5]) and (or) chemical (Tafel reaction [6]) pathway.…”

Section: ] Y = Z + M + ( Y = Z ) Mmentioning

confidence: 99%

Section: Raney Nickel Electrodesmentioning

confidence: 99%

See 1 more Smart Citation

A comparison of nickel boride and Raney nickel electrode activity in the electrocatalytic Hydrogenation of Phenanthrene

Mahdavi¹,

Łoś²,

Lessard³

et al. 1994

Can. J. Chem.

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“…The value of the exponent n close to 1.5 is consistent with a zero-nucleation rate [13] and isotropic crystallite growth from very small dimensions. Friedrich et al [14] and Trudeau et al [15] Thermal crystallization. X-ray diffraction patterns (Fig.…”

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution during Thermal Processing : Insight from In-Situ Time-Resolved Synchrotron Radiation Experiments

Bednarčík¹,

Nicula²,

Saksl³

et al. 2007

Materials Science Forum

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Abstract. The magnetic, mechanical or chemical properties of nanocrystalline materials strongly differ from the ones of their coarse-grained counterparts. Moreover, significant changes of the phase diagrams were already evidenced for nanostructured alloys. Thermal processing with or without applied pressure controls the microstructure development at the nanometer scale and thus essentially decides upon the final nanomaterial behaviour and properties. A common route for the synthesis of metallic nanomaterials is the devitrification of amorphous precursors obtained via non-equilibrium processing, e.g. by rapid solidification or high-energy ball-milling. Time-resolved in-situ X-ray diffraction experiments may nowadays be performed at high-brilliance synchrotron radiation sources for a variety of temperature-pressure conditions. The temperature-time evolution of the grain-size distribution and microstrain can be monitored in detail at specimen-relevant scales. Together with local information from electron microscopy and chemical analysis, in-situ X-ray experiments offer a complete set of tools for engineering of the microstructure in nanomaterials. The effect of individual processing steps can be distinguished clearly and further tuned. An example is provided, concerning the high-temperature microstructure development in Co-rich soft magnetic nanostructured alloys. IntroductionModern nanostructured soft-magnetic alloys typically consist of nanocrystalline ferromagnetic grains embedded in an amorphous phase. This type of nanocomposite microstructure provides an efficient averaging of the magneto-crystalline anisotropy and magnetostrictive coefficients of the nanophase over a large number of grains within the nanomaterial.During the past years, several Fe-based soft-magnetic nanostructured alloys were developed, e.g. Fe 73.5 Si 13.5 B 9 Nb 3 Cu 1 (FINEMET, [1] (HITPERM, [3]). The recent research on soft-magnetic nanocomposites was reviewed by several authors [4][5][6][7][8]. The search for bulk amorphous metallic glasses with good soft magnetic properties [8], further led to the discovery of Co-rich bulk amorphous alloys in the Co-Fe-M-B alloy system (M: Zr, Nb) [9]. The new Co-based amorphous alloys exhibit low coercivity and stable high permeability in the frequency range up to 1 MHz. Wide supercooled liquid regions of up to 80 K were evidenced for Co-Fe-Zr-B alloys with Fe content in excess of 14 at.%. Cobalt-rich alloys with nearly zero magnetostriction were as well obtained at lower Fe concentrations, near to 2 at.% [10]. There is an increasing interest in the further development of these alloys, in view of their unique combination of soft-magnetic and mechanical properties. In-situ high-temperature X-ray diffraction using synchrotron radiation and thermal analysis were used to investigate the nano-

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“…Very fine particles of nickel-aluminum alloys [18], FeCo-Ni-Si alloys [19], Ni-Mo alloys [20], for example, have been produced by mechanical milling. Contamination by the milling process, however, is a shortcoming of this process.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature, Anode-Supported High Power Density Solid Oxide Fuel Cells With Nanostructured Electrodes

Virkar¹

2000

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Nanocrystalline Fe-(Co,Ni)-Si-B: The mechanical crystallization of amorphous alloys and the effects on electrocatalytic reactions

Cited by 65 publications

References 18 publications

A comparison of nickel boride and Raney nickel electrode activity in the electrocatalytic Hydrogenation of Phenanthrene

A comparison of nickel boride and Raney nickel electrode activity in the electrocatalytic Hydrogenation of Phenanthrene

Microstructure Evolution during Thermal Processing : Insight from In-Situ Time-Resolved Synchrotron Radiation Experiments

Low-Temperature, Anode-Supported High Power Density Solid Oxide Fuel Cells With Nanostructured Electrodes

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